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The polarity of a track can be inverted in the Mixer Window by clicking on the track name button of a Mixer Strip and choosing Invert Polarity. When the polarity of a track is inverted a Ø will appear before the track name in the Mixer Strip. This could be used to correct the polarity of an input signal due to incorrect wiring or to prevent two signals that are out of phase with respect to each other causing cancellation when mixing.